Condensed Consolidated Statements Of Income (Loss) And Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		8 Months Ended
	Sep. 08, 2015	Sep. 09, 2014	Sep. 08, 2015	Sep. 09, 2014
Condensed Consolidated Statements Of Income (Loss) And Comprehensive Income (Loss) [Abstract]
Revenues	$ 68,629	$ 61,949	$ 217,507	$ 195,957
Costs and expenses:
Costs of sales	19,901	18,693	62,839	59,038
Restaurant operating expenses	34,625	30,046	103,832	90,654
Marketing and advertising costs	1,765	1,410	4,882	4,017
Pre-opening costs	2,044	1,577	3,790	2,867
General and administrative costs	5,225	4,673	16,611	14,202
Secondary public offering costs				5
Non-cash impairment charges	3,338		3,338
Depreciation and amortization	3,811	3,098	11,001	9,053
Operating income (loss)	(2,080)	2,452	11,214	16,121
Other income (expense), net:
Interest expense, net of capitalized interest	(11)	(18)	(43)	(49)
Other	(61)	(61)	(238)	(100)
Income (loss) before income taxes	(2,152)	2,373	10,933	15,972
Income tax (benefit) expense	(1,117)	588	2,861	4,896
Net income (loss)	$ (1,035)	$ 1,785	$ 8,072	$ 11,076
Basic income (loss) per common share:
Basic earnings (loss) per common share	$ (0.04)	$ 0.08	$ 0.34	$ 0.47
Diluted income (loss) per common share:
Diluted earnings (loss) per common share	$ (0.04)	$ 0.08	$ 0.34	$ 0.47
Shares used in computing earnings per common share:
Basic	23,360,744	23,464,306	23,416,502	23,513,905
Diluted	23,360,744	23,682,508	23,584,426	23,754,781
Comprehensive income (loss)	$ (1,035)	$ 1,785	$ 8,072	$ 11,076